[OPENMP] Initial parsing and sema analysis for 'update' clause of 'atomic' directive.

llvm-svn: 213735
diff --git a/clang/lib/Parse/ParseOpenMP.cpp b/clang/lib/Parse/ParseOpenMP.cpp
index a5bc4a4..024b1ab 100644
--- a/clang/lib/Parse/ParseOpenMP.cpp
+++ b/clang/lib/Parse/ParseOpenMP.cpp
@@ -342,7 +342,8 @@
 ///       | linear-clause | aligned-clause | collapse-clause |
 ///       lastprivate-clause | reduction-clause | proc_bind-clause |
 ///       schedule-clause | copyin-clause | copyprivate-clause | untied-clause |
-///       mergeable-clause | flush-clause | read-clause | write-clause
+///       mergeable-clause | flush-clause | read-clause | write-clause |
+///       update-clause
 ///
 OMPClause *Parser::ParseOpenMPClause(OpenMPDirectiveKind DKind,
                                      OpenMPClauseKind CKind, bool FirstClause) {
@@ -410,6 +411,7 @@
   case OMPC_mergeable:
   case OMPC_read:
   case OMPC_write:
+  case OMPC_update:
     // OpenMP [2.7.1, Restrictions, p. 9]
     //  Only one ordered clause can appear on a loop directive.
     // OpenMP [2.7.1, Restrictions, C/C++, p. 4]